reliable software utility designed to help you transform your computer
Fldigi is a modem application that features support for most digital modes used by radio amateurs. Its main functions are related to performing frequency measurement tests or calibrating a sound card to a signal.
The application relies on the system sound card to input and output audio-frequency signals. It works together with a standard HF SSB radio transceiver, while also controlling the radio using serial port connections.
All the popular modes are supported, including FM, AMS, LSB, RTTY, MFSK16, DominoEX, MFSK, Throb, Hell, Olivia, CW, and PSK. Fldigi enables you to control the transmitter, read incoming signals and tune the high-frequency propagation.
The configuration wizard starts at the first initialization, ready to guide you through
all the steps needed for choosing the functioning settings of Fldigi, from entering
the operator information and the audio devices to choosing the tabular data sources. Alternatively,
you can change the options at a later time using the designated menu.
Aside from the receiver and the transmitter pane
where you can view decrypted and sent messages, respectively,
the main interface also comprises a section dedicated to identifying and tuning the signal.
Depending on the selected method (Waterfall, FFT or Signal),
you can view a spectrogram display of signal strength versus frequency
or an oscilloscope representation of the captured raw audio.
The application features a built-in signal browser automatic mode detection and tuning, text capturing options
rig controlling capabilities, data logging, and advanced appearance
customization options. Common tasks can be automated
using macros and complete text, CSV or
Cabrillo reports can be generated with just a few clicks.
Overall, Fldigi is not difficult to use for those who know what all the buttons do,
but a strong knowledge base is required for exploiting its full potential,
especially since recognizing the different modes comes with experience.
It is dedicated to those who are really passionate about radio signals and want to learn more.
Supported digital modes
|Morse Code / CW||5 – 50 words-per-minute||Yes|
|PSK||31, 63, 63F, 125, 250, 500, 1000||No|
|FSQ||2, 3, 4.5, 6||No|
|IFKP||0.5, 1.0, 2.0||No|
|Contests||4/125, 4/250, 8/250, 4/500, 8/500, 16/500, 8/1000, 16/1000, 32/1000, 64/1000||Yes|
|dominoes||Micro, 4, 5, 8, 11, 16, 22, 44, 88||No|
|Hellschreiber||Feld Hell, Slow Hell, Feld Hell X5, Feld Hell X9, FSK Hell, FSK Hell-105, Hell 80||No|
|MFSK||4, 8, 11, 16, 22, 31, 32, 64, 64L, 128, 128L||No|
|MT63||500S, 1000S, 2000S, 500L, 1000L, 2000L||No|
|Olivia||4/250, 8/250, 4/500, 8/500, 16/500, 8/1000, 16/1000, 32/1000, 64/2000||Yes|
|QPSK||31, 63, 125, 250, 500||No|
|8PSK||125, 250, 500, 1000, 125FL, 250FL, 125F, 250F, 500F, 1000F, 1200F||No|
|PSKR||125R, 250R, 500R, 1000R||No|
|RTTY||45.45/170, 50/170, 75/170, 75/850||Yes|
|THOR||Micro, 4, 5, 8, 11, 16, 22, 25×4, 50×1, 50×2 100||No|
|Throb / ThrobX||1, 2, 4 / X1, X2, X4||No|
Fldigi is based on the lightweight portable graphics library FLTK and the C/C++ language. Because of this, the software can run on many different
- Microsoft Windows (2000 or newer)
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